L1 /
6
CH1012
PURIFICATION
2.
Purification of Organic Compounds
1) Crystallisation
• Relies on differences
in solubilty of A and the impurities present.
(A is
the cmpd. to be purified)
• The mixture is placed in conditions where the solution is saturated with respect to A
• A will
therefore crystallize leaving
the impurities behind. (eg. cooling)
the impurities behind. (eg. cooling)
• Often the final step ® high purity
